Excuse me sindito, but could you help me? I have some questions, please ?

1- Which software you used to edit the textures?

2- I've extracted mine to .dds, and tried with GIMP to remove the skirt and bra of the girls at the pool, by erasing them to transparent and by painting with the pink color for transparency, but nothing gets removed. I see the textures has changed, but did not became transparent.

3- When I save with GIMP, the plugin shows me some dialogs and I don't know which to chose, here: